ML19308A730

Supplemental Abnormal Occurrence Rept AO-269/74-12A Re Event on 740806.Describes Further Tests Performed 740819-0901 to Determine Cause of Low Boron Concentration.No Mechanism Identified for Cause of Dilution in Incore Flood Tank

ML19308A730
Person / Time
Site:	Oconee
Issue date:	10/18/1974
From:	DUKE POWER CO.
To:
Shared Package
ML19308A729	List: ML19308A728 ML19308A730
References
NUDOCS 7912100562
Download: ML19308A730 (1)

Text

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OCONEE UNIT 1  !

A0-269/74-12A.  !

SUPPLEME' ITAL ABNOR::AL OCCURRENCE REPO 18, 1974 <

October  !

Supplemental Reoort Datel August 6, 1974 1 Occorrence Datei Oconee Unit 1, Seneca, South Carolina flood Facilitv:

Low boric acid concentration in 1B core Identification of Occurrenceitank Unit 1 at 100 percent full power ,l Report Conditions Prior to OccurrenceiAs Description of Occurrencel A0-269/74-12 dated August 22, 1974described in Abnor Analysis of Occurrence:

concentration in the IB Core Flood l monitoring program, in addition The source, volume,to Due to an unaccountable illance, wasdecrease instituted. in boronTank for O the normal core flood tank <urve dd nd the level and pressure of theAna and' boron concentration of all makeup acore flood tank and af ter each makeup for boron concen September 1, 1974, five addition During the test period, August 19 toborated water k were and the hish pressure injection system.d boron concentrations.the normal speciesl were in close agreement with calculateisotopes This monitoring program has not in the c aused the dilution of the contents from the high pressure injection system. identified a me l of the core flood tank which occurre

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